Machine for truing the bases of tenpins.



E. c J, ADELL. MACHINE FOR TRUING THE` BASES 0F TENPlNS.

APPLIQATION H LBD H2B. 1s, wos.-

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EDWARD ADELL AND JOHN ADELL, F BANGE, MASSACHUSETTS.

MACHINE FOR TRUING THE BASES OF TENPINS.

Specification of Letters Patent.

Application filed February 16` 1909. Serial No. 4178.190.

invented a new and llnprovetl Machine for "l-ning the .l-ases oll 'l`enpins. ol which the following is a i'ull. clear', and exact descripi tion.

This invention relates to a niaehine t'or truiug-the bases ot. tenpins, and niore particularly such as includes a traine having a cutter arranged thereon. a ehuek tor holding" the work, and nieans for rotating one ot the partsl whereby the cutter will operate to true the hase of the work;

The object ol: the invention is to provide a device of the class described. `siuiplx and lserviceable in construction and inexpensive to manufacture, which can he easily operated by hand, and which has a manually y controllable lever tor feedingv the work to the cutter. l

ltet'erenee is to 'ne had to the accompanyiup,` drawings orn'iino' a part ot' this speci lieation, in which similar characters of ret'- erenee indicate corresponding parts in all the views.

Figure l is a l'ront elevation olvl an en1- liodinient olf our invention; ["igr. 2 is aside elevation ol the saine, having` one'ot' the supporting uprights hroken away; Fig. 3 is a eross section on the line liv-23 of Fig. 1; and Fig. 4 is an inverted plan view of the chuck.

,Pietore proeeediing;l to a more detailed description o1 our inventitun it` should he nnderstood that` we have provided a machine which, although it is especially adapted for truing the bases ot' tenpins, eandlepins, duck pins or the like, niay he employed for other purposes where a similar service is required of it.

After tenpins have been used for some time, they become hattered and do no't stand irnily on their bases. To remedy this dilti eulty, we have provided a machine which is simple in construction, and which, when the pin has heen operatively positioned, will true the hase of the latter, thus ohviating the necessity of usinga lathe. f, Y ln the speeitie torni shown in the drawings, we provide a. traine 1 of any suitable nietzal. such as iron or the like, and ineluding a hase 2, a back 3 and a top 4. The lower end 5 oi the hack 3 is laterally disposed and is secured to the hase by means of 'llatent'ed dan, 25, 191.0;

i rivets (3 or the lilte. 'l`he upper end of the y Inipportini;l uprights S) having4 their upper ends eonstrieted and threaded, the latter heini;Y adapted to he passed through the openings S in the top and to he secured in plat-e by nieans ot' nuts 11.

liocatetlon the top is a sleeve 12 having an opening 123 extending;` therethrough and through the top. 'lhe sleeve acts as a bearing `tor a spindle l1 \\jhich'extcnds therethrough and which, at its lower end, carries a chuck lo. lhc latter is provided'with an outwardly disposed flange 16 which has a plurality of recesses 1T eut therein. Near its portion 1S which toi-nis a. shoulder 19. Arranged on the upper end ot' the spindle is an operating handle '220 ha vingl a grip 21 where`- hy the` spindle and the chuck can be rotated. -l

Secured to one ofthe ends 7 of the top by means ot' a pivot pin 22 is a feed lever having its upper end laterally disposed and provided with a gap adapted to engage the spindle at the eonstrieted portion 18, so that when the feed lever is either raised `or lowered, the portion Q5 ot the link will engage the shoulder 19 to raise or lower the spindle and the chuck to control the work.

Rigid with the base 2 of the traine is a block QG having a cutaway portion 27. The block ie provided with an inclined groove or slot'- "38 which serves to receive a cutter Q9. 'l`he latter is provided with an outwardly disposed extension 'and has its edge 3l beveled. Located in a threaded opening 32 28 is an adjusting screw 33 which abuts against the rear of the cutter and serves for the adjusting of the saine. Mounted in an opening 34 on the fronty of the block 'is a keeper 35 which engages the extension 30 of the cutter to hold the latter against lateral displacement.. A lscrew 3G serves to reta-in the keeper in place. l

Adjacent to the cutaway portion 27 of the block and rigid with the latter is a stud 37 which serves to center the work while it is being rotated.

In the operation of the device, when it is i desired to true the hase of the tenpin, the

upper end the spindle l-t luis a const-rieted.

with openings Rigid withthe hase 2 are livotally arranged on the lever is a link 2t l in the block which connects with the groove spindle and the chuck are raised by means of the lever 23 so that the base of the tenpin may be arranged on the block 2G, the stud 37 being' inserted at the center of the base. The spindle is then lowered by 1neans of the -lever until 'the chuck is in engagement with the top of the pin. Atthis point, the handle 20 is operated and Athe tenpin rotated. As a constant pressure is applied to the lever, the base of the tenpin is forced into engagement with the cutter, and the latter serves t0 plane the base until it is again true. The edges of the recesses of the chuck serve to grip the'head of the pin, the chuck being outwardly taperedto facilitate the engagement thereof with the work;

The cutter edge 3l is inclined with respect to the length of the eutte1,whereby it penetrates more deeply into the work nearer the center than the edge thereof. Thus theJ base of the pin trued is recessed to permit it to ,stand lirmlynpon the edge portion of the oase.

Having thus described 'our invention, we elaiin as new and desire ato secure by Letters Patent:

l. In a machine of the 'class described, a frame having a rotatable chuck arranged thereon, a block rigid with the base of said frame, said block having a slot, a cutter adjustably arranged in said slot, a keeper adapted to engage said cutter, and a stud mounted on said block and adapted to be inserted into the base of the work at the center thereof.

2. In a machine of the class described, a franle consisting of a top, a back and a base, supporting uprights connectingI said top and said base, said top having an opening extending therethrough, a spindle arranged within said opening and having` a chuck at one end thereof, a handle rigid with the other end of said spindle, said spindle having a con- Strict'ed portion, a lever pivotally secured to said top, a link arranged on said lever and having its upper end laterallydisposed and provided with ay gap, said gap receiving the constricted portion of said spindle, whereby said lever can be employed to raise or lower said chuck, a block rigid with the base of said frame and provided with a slot, a cutter adjnstably located in said slot, a keeper arranged on the outside of said block and adapted to engage said cutter, and a stud rigid with said block and adapted to be iuf'f serted in the base of the work'to prevent the Alateral displacement of the latter.

3. In a machine of the class described, a block provided with a slot, a cutter adjustable in the slot, a keeper on the block for engaging the cutter, and a stud secured to the block for the purpose set forth.

. In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

EDWARD ADELL.

J OHN ADELL.

Witnesses Annanair L. ToLuAN, VILTJAM A. CLARK, Jr 

